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When to use Hadoop, HBase, Hive and Pig?
What are the benefits of using either Hadoop or HBase or Hive ?
16 Answers
16
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What is the instanceof operator in JavaScript?
The instanceof keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language.
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What are the downsides to using Dependency Injection? [closed]
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A couple of points:
DI increases complexity, usually by increasing the number of classes since responsibilities are separated more, which is not always beneficial
Your code will be (somewhat) coupled to the dependency injection framework you use (or more generally ...
What's the best way to check if a file exists in C?
...p the access() function, found in unistd.h. You can replace your function with
if( access( fname, F_OK ) != -1 ) {
// file exists
} else {
// file doesn't exist
}
You can also use R_OK, W_OK, and X_OK in place of F_OK to check for read permission, write permission, and execute permission ...
Compare two MySQL databases [closed]
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If you're working with small databases I've found running mysqldump on both databases with the --skip-comments and --skip-extended-insert options to generate SQL scripts, then running diff on the SQL scripts works pretty well.
By skipping comm...
What exactly is a reentrant function?
Most of the times , the definition of reentrance is quoted from Wikipedia :
7 Answers
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Is the NOLOCK (Sql Server hint) bad practice?
I'm in the business of making website and applications that are not mission critical -> eg. banking software, space flight, intensive care monitoring application, etc. You get the idea.
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Should the folders in a solution match the namespace?
...o, note that if you use the built-in templates to add classes to a folder, it will by default be put in a namespace that reflects the folder hierarchy.
The classes will be easier to find and that alone should be reasons good enough.
The rules we follow are:
Project/assembly name is the same as t...
Android: Storing username and password?
...sword to be used inside an Android application, what is the best way to do it? Is it through the preferences screen (but what if the user misses this?), or pop up a dialog box and ask the user for the credentials? If so, I do have to maintain state for the application. How would I do this?
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Is it good practice to use the xor operator for boolean checks? [closed]
I personally like the exclusive or , ^ , operator when it makes sense in the context of boolean checks because of its conciseness. I much prefer to write
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